Undo then Redo Creating a Spawnable in Sequencer Creates Extra Actor in Level

There is a bug when performing an undo/redo on pasted or spawned actors in Sequencer. 

It appears that the transaction system is re-creating an actor on redo, but Sequencer doesn't see that, so it Spawns its own actor - doubling up the spawned actors in the World Outliner.

This happens when:

1. Dragging a new actor in, undo, then redo.
2. Duplicating a spawnable from within Sequencer, undo, then redo.
3. Copy/paste a spawnable from within Sequencer, undo, then redo.

The same bug 5.2 but is repeatable in //UE5/Main as well.    I also checked UE5.0 and UE4.27, and the same issue appears in those a well - verifying it is not a regression.

To repro:

1. Create a new Third Person Character template.
2. Create a New Level Sequence for the level.
3. From the Place Actors panel, drag and drop Actor into Sequencer.
4. Undo the operation (Ctrl + Z)
5. Redo the operation (Ctrl + Y)
6. Notice that there are now two actors in the Outliner
7. In order to get rid of the extra actor, I have delete it manually or reload the level.

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